pyonta cansat / MPL3115

test

Dependents:   FM_integration_copy

Fork of MPL3115A2 by Michael Lange

Altitude.h@4:a9ee44b59212, 2017-09-06 (annotated)

Committer:
pyonta2017
Date:
Wed Sep 06 15:12:42 2017 +0000
Revision:
4:a9ee44b59212
Parent:
3:7c7c1ea6fc33 
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Who changed what in which revision?

UserRevisionLine numberNew contents of line
sophtware 0:beb43bc3d6d4 1 /*
sophtware 0:beb43bc3d6d4 2 MPL3115A2 Barometric Pressure and Tempurature Sensor Library
sophtware 0:beb43bc3d6d4 3 By: Michael Lange
sophtware 0:beb43bc3d6d4 4 Date: March 31, 2014
sophtware 0:beb43bc3d6d4 5 License: This code is public domain.
sophtware 0:beb43bc3d6d4 6
sophtware 0:beb43bc3d6d4 7 This class encapsulates an altitude reading from the sensor.
sophtware 0:beb43bc3d6d4 8
sophtware 0:beb43bc3d6d4 9 */
sophtware 0:beb43bc3d6d4 10
sophtware 0:beb43bc3d6d4 11
sophtware 0:beb43bc3d6d4 12 #ifndef ALTITUDE_H
sophtware 0:beb43bc3d6d4 13 #define ALTITUDE_H
sophtware 0:beb43bc3d6d4 14
sophtware 0:beb43bc3d6d4 15 #include "mbed.h"
sophtware 0:beb43bc3d6d4 16
sophtware 3:7c7c1ea6fc33 17 //! Casting a float to a char truncates, therefore negative numbers become positive.
sophtware 3:7c7c1ea6fc33 18 //! This will properly cast a float in the range -128 to 127 to a char.
sophtware 0:beb43bc3d6d4 19 #define float_to_char(x) (((x)<0)?(-(char)(x)):((char)(x)))
sophtware 0:beb43bc3d6d4 20
sophtware 2:2ebc9c0d4a54 21 //! Altitude provides a wrapper around altitude data coming from the sensor. The class handles
sophtware 2:2ebc9c0d4a54 22 //! working with compressed data from the sensor and provides convenient functions for retreiving
sophtware 2:2ebc9c0d4a54 23 //! the data in various units (with room to add more if needed).
sophtware 0:beb43bc3d6d4 24 class Altitude
sophtware 0:beb43bc3d6d4 25 {
sophtware 0:beb43bc3d6d4 26 public:
sophtware 0:beb43bc3d6d4 27
sophtware 2:2ebc9c0d4a54 28 //! The size of the compressed data buffer from the sensor. Used in an I2C read.
sophtware 0:beb43bc3d6d4 29 static const int size = 3;
sophtware 2:2ebc9c0d4a54 30
sophtware 2:2ebc9c0d4a54 31 //! The units we support converting the sensor data to.
sophtware 0:beb43bc3d6d4 32 enum unitsType { METERS, FEET };
sophtware 0:beb43bc3d6d4 33
sophtware 0:beb43bc3d6d4 34 Altitude();
pyonta2017 4:a9ee44b59212 35 Altitude(float a, unitsType units = METERS);
sophtware 0:beb43bc3d6d4 36 Altitude(const char* compressed);
sophtware 0:beb43bc3d6d4 37 Altitude(const char msb, const char csb, const char lsb);
sophtware 0:beb43bc3d6d4 38
sophtware 2:2ebc9c0d4a54 39 //! Allows using the object directly in an I2C read operation.
sophtware 0:beb43bc3d6d4 40 operator char*(void) { return _compressed; }
sophtware 2:2ebc9c0d4a54 41 //! Same as calling altitude with METERS as the parameter.
sophtware 0:beb43bc3d6d4 42 operator float(void) { return _altitude; }
sophtware 0:beb43bc3d6d4 43
sophtware 2:2ebc9c0d4a54 44 //! Returns the altitude in the units you specifiy, defaulting to FEET if none specified.
pyonta2017 4:a9ee44b59212 45 float altitude(unitsType units = METERS);
sophtware 2:2ebc9c0d4a54 46 //! Call to decompress the sensor data after an I2C read.
sophtware 0:beb43bc3d6d4 47 void setAltitude();
sophtware 0:beb43bc3d6d4 48 void setAltitude(const char* compressed);
sophtware 0:beb43bc3d6d4 49 void setAltitude(const char msb, const char csb, const char lsb);
pyonta2017 4:a9ee44b59212 50 void setAltitude(float a, unitsType units = METERS);
sophtware 0:beb43bc3d6d4 51
sophtware 2:2ebc9c0d4a54 52 //! Returns the altitude as a string in the units specified, defaulting to FEET if none specified.
pyonta2017 4:a9ee44b59212 53 const char* print(unitsType units = METERS);
sophtware 0:beb43bc3d6d4 54
sophtware 2:2ebc9c0d4a54 55 //! Converts meters to feet.
sophtware 0:beb43bc3d6d4 56 static float MetersToFeet(float meters) { return meters * 3.28084; }
sophtware 2:2ebc9c0d4a54 57 //! Converts feet to meters.
sophtware 0:beb43bc3d6d4 58 static float FeetToMeters(float feet) { return feet / 3.28084; }
sophtware 0:beb43bc3d6d4 59
sophtware 0:beb43bc3d6d4 60 private:
sophtware 0:beb43bc3d6d4 61 float _altitude;
sophtware 0:beb43bc3d6d4 62 char _compressed[3];
sophtware 0:beb43bc3d6d4 63 char _printBuffer[9];
sophtware 0:beb43bc3d6d4 64 };
sophtware 0:beb43bc3d6d4 65
sophtware 0:beb43bc3d6d4 66 #endif // ALTITUDE_H